Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fef4f73d62c0479…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 15:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94aca27b0813a5b0bc4851277a5a9a74 SHA-1: e32ce50972a2b22f05c4353005e6b10f831fb588 SHA-256: 8fef4f73d62c0479a03d9985a808f46714777f3dfa73752728fc315a1166d4b6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, with one pointing directly to an IP address, suggesting an attempt to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://khotelmarket.com/FileData/ckfinder/files/20210912_19D703D1A6DF05F4.pdf In PDF document text
    • https://go2germany.ru/files/file/vuromuzubobimubiz.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bawudasaxabavilosobekogel.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/131143336.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jewewowuromofusifetotux.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/sozirepelovavunugagem.pdfIn PDF document text
    • http://jiab.net/userData/board/file/lotajemamerota.pdfIn PDF document text
    • http://envigest.cz/upload/file/51973722832.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/1894998109.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xufipuwubulo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba02b0f8d---58515234783.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/71784501454.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-13/20210913070245835875.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/govonujatovuzu.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/70928405449.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/63197787957.pdfIn PDF document text
    • https://ferropula.hr/files/bitiwapumis.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8q12mkjirg8shfa0daodhvgppd/18758111173.pdfIn PDF document text
    • http://rc-modeller.se/images/file///mirepedalewoguronalagigum.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/18040424395.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/jigeworemokibu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rovapedunu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0c0cedf1---didara.pdfPDF link annotation
    • http://wadsoda.com/UserFiles/File/38712416260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=beyblade+burst+valtryek+v6+qr+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 11044 bytes
SHA-256: 92fbbd9f509d67776ba2b0f9a2e0aa6cc08264a2594abbef32ef8d282d781cfc
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 18532 bytes
SHA-256: ef410c6cce4eb5548990a45cc36b6845e06791fad65e0621eda8fb6431b6ec2f